introduce-mirror-test-protocol.patch
Signed-off-by: Andy Green <andy@warmcat.com>
This commit is contained in:
Andy Green
parent
85ba32fcbf
commit
fe2a0d2e88
2 changed files with 233 additions and 14 deletions
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@ -27,6 +27,20 @@
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#include "../lib/libwebsockets.h"
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/*
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* This demo server shows how to use libwebsockets for one or more
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* websocket protocols in the same server
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*
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* It defines the following websocket protocols:
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*
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* dumb-increment-protocol: once the socket is opened, an incrementing
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* ascii string is sent down it every 50ms.
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* If you send "reset\n" on the websocket, then
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* the incrementing number is reset to 0.
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*
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*/
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#define LOCAL_RESOURCE_PATH "/usr/share/libwebsockets-test-server"
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static int port = 7681;
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static int use_ssl = 0;
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@ -95,6 +109,7 @@ callback_dumb_increment(struct libwebsocket * wsi,
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break;
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case LWS_CALLBACK_RECEIVE:
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fprintf(stderr, "rx %d\n", len);
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if (len < 6)
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break;
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if (strcmp(in, "reset\n") == 0)
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@ -109,6 +124,91 @@ callback_dumb_increment(struct libwebsocket * wsi,
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}
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/* lws-mirror_protocol */
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#define MAX_MESSAGE_QUEUE 64
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const int MAX_COMMUNE_MEMBERS = 20;
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struct per_session_data__lws_mirror {
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struct libwebsocket * wsi;
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int ringbuffer_tail;
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};
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struct a_message {
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struct per_session_data * sender;
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void * payload;
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size_t len;
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};
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static struct a_message ringbuffer[MAX_MESSAGE_QUEUE];
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static int ringbuffer_head;
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struct per_session_data * all_members;
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static int
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callback_lws_mirror(struct libwebsocket * wsi,
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enum libwebsocket_callback_reasons reason,
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void * user, void *in, size_t len)
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{
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int n;
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char buf[LWS_SEND_BUFFER_PRE_PADDING + 512 +
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LWS_SEND_BUFFER_POST_PADDING];
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unsigned char *p = (unsigned char *)&buf[LWS_SEND_BUFFER_PRE_PADDING];
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struct per_session_data__lws_mirror * pss = user;
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switch (reason) {
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case LWS_CALLBACK_ESTABLISHED:
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pss->wsi = wsi;
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pss->ringbuffer_tail = ringbuffer_head;
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break;
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case LWS_CALLBACK_SEND:
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/* send everything that's pending */
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while (pss->ringbuffer_tail != ringbuffer_head) {
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n = libwebsocket_write(wsi,
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(unsigned char *)ringbuffer[pss->ringbuffer_tail].payload +
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LWS_SEND_BUFFER_PRE_PADDING,
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ringbuffer[pss->ringbuffer_tail].len,
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LWS_WRITE_TEXT);
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if (n < 0) {
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fprintf(stderr, "ERROR writing to socket");
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exit(1);
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}
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if (pss->ringbuffer_tail == (MAX_MESSAGE_QUEUE - 1))
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pss->ringbuffer_tail = 0;
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else
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pss->ringbuffer_tail++;
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}
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break;
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case LWS_CALLBACK_RECEIVE:
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// fprintf(stderr, "Received %d bytes payload\n", (int)len);
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ringbuffer[ringbuffer_head].payload =
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malloc(LWS_SEND_BUFFER_PRE_PADDING + len +
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LWS_SEND_BUFFER_POST_PADDING);
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ringbuffer[ringbuffer_head].len = len;
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ringbuffer[ringbuffer_head].sender = pss;
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memcpy(ringbuffer[ringbuffer_head].payload +
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LWS_SEND_BUFFER_PRE_PADDING, in, len);
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if (ringbuffer_head == (MAX_MESSAGE_QUEUE - 1))
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ringbuffer_head = 0;
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else
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ringbuffer_head++;
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break;
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default:
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break;
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}
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return 0;
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}
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/* list of supported protocols and callbacks */
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static const struct libwebsocket_protocols protocols[] = {
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@ -123,6 +223,12 @@ static const struct libwebsocket_protocols protocols[] = {
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.per_session_data_size =
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sizeof(struct per_session_data__dumb_increment),
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},
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{
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.name = "lws-mirror-protocol",
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.callback = callback_lws_mirror,
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.per_session_data_size =
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sizeof(struct per_session_data__lws_mirror),
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},
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{ /* end of list */
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.callback = NULL
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}
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@ -15,48 +15,161 @@ reset the number.<br><br>
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<tr>
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<td align=center><input type=button id=offset value="Reset counter" onclick="reset();" ></td>
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<td width=100 align=center><div id=number> </div></td>
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<td id=statustd align=center><div id=wsstatus>Not initialized</div></td>
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<td id=wsdi_statustd align=center><div id=wsdi_status>Not initialized</div></td>
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</tr>
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</table>
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<h2>libwebsockets "lws-mirror-protocol" test applet</h2>
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Use the mouse to draw on the canvas below -- all other browser windows open
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on this page see your drawing in realtime and you can see any of theirs as
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well.
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<p>
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The lws-mirror protocol doesn't interpret what is being sent to it, it just
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re-sends it to every other websocket it has a connection with using that
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protocol, including the guy who sent the packet.
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<br><br>
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<table>
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<tr>
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<td>Drawing color:
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<select id="color" onchange="update_color();">
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<option value=#000000>Black</option>
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<option value=#0000ff>Blue</option>
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<option value=#20ff20>Green</option>
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<option value=#802020>Dark Red</option>
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</select>
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</td>
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<td id=wslm_statustd align=center><div id=wslm_status>Not initialized</div></td>
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</tr>
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<tr>
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<td colspan=2 width=500 align=center style="background-color: #e0e0e0;"><div id=wslm_drawing> </div></td>
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</tr>
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</table>
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<script>
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var pos = 0;
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var websocket_ads;
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function get_appropriate_ws_url(ads)
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{
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/*
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* We open the websocket encrypted if this page came on an
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* https:// url itself, otherwise unencrypted
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*/
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if (document.URL.substring(0, 5) == "https")
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websocket_ads = "wss://127.0.0.1:7681";
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return "wss://"+ads;
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else
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websocket_ads = "ws://127.0.0.1:7681"
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return "ws://"+ads;
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}
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/* dumb increment protocol */
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var socket = new WebSocket(websocket_ads, "dumb-increment-protocol");
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var socket_di = new WebSocket(get_appropriate_ws_url("127.0.0.1:7681"),
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"dumb-increment-protocol");
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try {
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socket.onopen = function() {
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statustd.style.backgroundColor = "#40ff40";
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wsstatus.textContent = " websocket connection opened ";
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socket_di.onopen = function() {
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wsdi_statustd.style.backgroundColor = "#40ff40";
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wsdi_status.textContent = " websocket connection opened ";
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}
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socket.onmessage =function got_packet(msg) {
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socket_di.onmessage =function got_packet(msg) {
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number.textContent = msg.data + "\n";
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}
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socket.onclose = function(){
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statustd.style.backgroundColor = "#ff4040";
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wsstatus.textContent = " websocket connection closed ";
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socket_di.onclose = function(){
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wsdi_statustd.style.backgroundColor = "#ff4040";
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wsdi_status.textContent = " websocket connection closed ";
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}
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} catch(exception) {
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alert('<p>Error'+exception);
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alert('<p>Error' + exception);
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}
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function reset() {
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socket.send("reset\n");
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socket_di.send("reset\n");
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}
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/* lws-mirror protocol */
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var down = 0;
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var no_last = 1;
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var last_x, last_y;
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var ctx;
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var socket_lm = new WebSocket(get_appropriate_ws_url("127.0.0.1:7681"),
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"lws-mirror-protocol");
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var color = "#000000";
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try {
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socket_lm.onopen = function() {
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wslm_statustd.style.backgroundColor = "#40ff40";
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wslm_status.textContent = " websocket connection opened ";
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}
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socket_lm.onmessage =function got_packet(msg) {
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i = msg.data.split(' ');
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if (i[0] == 'd') {
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ctx.strokeStyle = i[1];
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ctx.beginPath();
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ctx.moveTo(i[2], i[3]);
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ctx.lineTo(i[4], i[5]);
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ctx.stroke();
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}
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}
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socket_lm.onclose = function(){
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wslm_statustd.style.backgroundColor = "#ff4040";
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wslm_status.textContent = " websocket connection closed ";
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}
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} catch(exception) {
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alert('<p>Error' + exception);
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}
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var canvas = document.createElement('canvas');
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canvas.height = 300;
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canvas.width = 480;
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ctx = canvas.getContext("2d");
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document.getElementById('wslm_drawing').appendChild(canvas);
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canvas.addEventListener('mousemove', ev_mousemove, false);
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canvas.addEventListener('mousedown', ev_mousedown, false);
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canvas.addEventListener('mouseup', ev_mouseup, false);
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function update_color() {
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color = document.getElementById("color").value;
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}
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function ev_mousedown (ev) {
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down = 1;
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}
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function ev_mouseup(ev) {
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down = 0;
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no_last = 1;
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}
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function ev_mousemove (ev) {
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var x, y;
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x = ev.offsetX;
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y = ev.offsetY;
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if (!down)
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return;
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if (no_last) {
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no_last = 0;
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last_x = x;
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last_y = y;
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return;
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}
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socket_lm.send("d " + color + " " + last_x + " " + last_y + " " + x + ' ' + y);
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last_x = x;
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last_y = y;
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}
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</script>
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</body>
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